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usb: gadget: f_uac2: fixup feedback endpoint stop

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When the uac2 function is stopped, there seems to be an issue reported on
some platforms (Intel Merrifield at least)

BUG: kernel NULL pointer dereference, address: 0000000000000008
...
RIP: 0010:dwc3_gadget_del_and_unmap_request+0x19/0xe0
...
Call Trace:
 dwc3_remove_requests.constprop.0+0x12f/0x170
 __dwc3_gadget_ep_disable+0x7a/0x160
 dwc3_gadget_ep_disable+0x3d/0xd0
 usb_ep_disable+0x1c/0x70
 u_audio_stop_capture+0x79/0x120 [u_audio]
 afunc_set_alt+0x73/0x80 [usb_f_uac2]
 composite_setup+0x224/0x1b90 [libcomposite]

The issue happens only when the gadget is using the sync type "async", not
"adaptive". This indicates that problem is coming from the feedback
endpoint, which is only used with async synchronization mode.

The problem is that request is freed regardless of usb_ep_dequeue(), which
ends up badly if the request is not actually dequeued yet.

Update the feedback endpoint free function to release the endpoint the same
way it is done for the data endpoint, which takes care of the problem.

Fixes: 24f779dac8 ("usb: gadget: f_uac2/u_audio: add feedback endpoint support")
Reported-by: Ferry Toth <ftoth@exalondelft.nl>
Tested-by: Ferry Toth <ftoth@exalondelft.nl>
Acked-by: Felipe Balbi <balbi@kernel.org>
Signed-off-by: Jerome Brunet <jbrunet@baylibre.com>
Link: https://lore.kernel.org/r/20210827075853.266912-1-jbrunet@baylibre.com
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
This commit is contained in:
Jerome Brunet 2021-08-27 09:58:53 +02:00 committed by Greg Kroah-Hartman
parent ef52b4a9fc
commit 75432ba583
1 changed files with 11 additions and 4 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

15
drivers/usb/gadget/function/u_audio.c
View File

@ -230,7 +230,13 @@ static void u_audio_iso_fback_complete(struct usb_ep *ep,
int status = req->status;
/* i/f shutting down */
if (!prm->fb_ep_enabled || req->status == -ESHUTDOWN)
if (!prm->fb_ep_enabled) {
kfree(req->buf);
usb_ep_free_request(ep, req);
return;
}
if (req->status == -ESHUTDOWN)
return;
/*
@ -421,9 +427,10 @@ static inline void free_ep_fback(struct uac_rtd_params *prm, struct usb_ep *ep)
prm->fb_ep_enabled = false;
if (prm->req_fback) {
usb_ep_dequeue(ep, prm->req_fback);
kfree(prm->req_fback->buf);
usb_ep_free_request(ep, prm->req_fback);
if (usb_ep_dequeue(ep, prm->req_fback)) {
kfree(prm->req_fback->buf);
usb_ep_free_request(ep, prm->req_fback);
}
prm->req_fback = NULL;
}